earth as a magnet

earths magnetic poles

Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts the most force.

two north poles

Although the needle of a compass always points north, it doesnt point to Earths north geographic pole. Find the north geographic pole in the Figure 1.2. As you can see, it is located at 90 north latitude. Where does a compass Q: The north end of a compass needle points toward Earths north magnetic pole. The like poles of two magnets repel each other, and the opposite poles attract. So why doesnt the north end of a compass needle point to Earths south magnetic pole instead? A: The answer may surprise you. The compass needle actually does point to the south pole of magnet Earth. However, it is called the north magnetic pole because it is close to the north geographic pole. This naming convention was adopted a long time ago to avoid confusion.

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earths magnetic field

Like all magnets, Earth has a magnetic field. Earths magnetic field is called the magnetosphere. You can see a model of the magnetosphere in the Figure 1.3. It is a huge region that extends outward from Earth in all directions. Earth exerts magnetic force over the entire field, but the force is strongest at the poles, where lines of force converge. Click image to the left or use the URL below. URL:

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instructional diagrams

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questions

which shape of magnet does magnet earth resemble?

a) horseshoe magnet

-->  b) bar magnet

c) disc magnet

d) none of the above

the place generally referred to as earths magnetic north pole is located closest to

a) 90 degrees north latitude.

-->  b) 80 degrees north latitude.

c) 70 degrees north latitude.

d) 60 degrees north latitude.

earth has two north poles and two south poles.

-->  a. true

b. false

which of the following statements about earths magnetic field is false?

a) it extends outward from earth in all directions.

-->  b) it is strongest at the equator.

c) its lines of magnetic force converge at the poles.

d) none of the above

a compass needle always points to earths geographic north pole.

a. true

-->  b. false

the like poles of two magnets always attract each other.

a. true

-->  b. false

earths magnetic field is a huge region.

-->  a. true

b. false

diagram questions

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